Press



Jilly 24, 1934. BYERLEIN 1,967,464

PRESS Filed May 19, 1933 2 Shets-Sheet 1 July 24, 1934. A. A. BYERLEINV PRESS Filed May 19, 1953 2 Sheets-Sheet 2 [Patented July 24, i934 entire stares T FFECE General Machinery (Corporation, Hamilton,

Ohio, a corporation of Delaware Application May is, was, serial No. cancer 8 (Claims.

This invention relates to power presses and more particularly to presses for drawing sheet metal or the like.

One object of the invention is the provision of a metal drawing press having a plurality of toggle operated upper slides reciprocated by an upper crank shaft, a lower slide being provided for cooperation with the upper slides and operated from direct connections eccentrically connected to said crank shaft.

Another object of the invention is the provision of a press having an upper crank shaft for operating die slide means provided in an upper portion of a press, a lower slidebeing provided for reciprocatory movement in a lower portion of the frame and operatedby direct driving connections extending up along opposite sides of the frame to said crank shaft, the path of movement of the lower slide being adjustable as to height.

Another object of the invention is the provision of a power press havinga plurality of upper die slides operated with dwells in their movements, an additional slide being mounted for reciprocatory movement in the lower portion of the press for cooperation with the upper slides and operated by simple means symmetrically arranged on opposite sides of the press frame.

Other objects and advantages of the invention will be apparent from the following description, the appended claims and the accompanying drawings, in which-- Fig. 1 is a front elevation of a power press em-, bodying the present invention;.

Fig. 2 is a side elevation of the press; and

Fig. 3 is a diagrammatic view showing the timed relationship of the various slides. I

Referring more particularly to the drawings, 10 designates generally the frame of a power press.

in the upper portion of which are the first and second die carrying slides 11 and 12, both of which are mounted for reciprocatory movement in proper timed relationship so that the slide 11 may descend first and dwell for a period of time while the die carried by t e slide 12 is efiective in drawing the metal. Th two slides 11 and 12, as shown, are operated by a system of toggle levers, both having a dwell period by reason of the relative arrangement of the centers of the various operating parts.

Rotatably mounted in an upper portion of the press frame is a crank shaft 13. This shaft is rotated by two gears 14 and 15 each of which meshes with a pinion 16. The two pinions 16 are provided on a shaft 18 extending transversely of the press which also carries a gear 17 which is in meshing engagement with the driving pinion 19 provided on a transverse shaft 20 which is driven by a suitable motor 21 connected to the pulley wheel .22 by a belt 23 or other'suitable driving connection.

The two gears 14 and 15 are each provided with an eccentric stud 25 which is connected by an arm 26 to a vertically reciprocatory slide block 27,. the two slide blocks, one at either side of the frame, being connected to the four rock shaft extensions 28 in the same manner as is more fully explained in my prior Patent No. 1,768,503. patented June 24. 1930. The rock shaft extensions 28 are rigid with the short toggle arms 30 pivotally connected to the toggle links 31 for operating the inner slide 12 with a suitable dwell in its movements. The connection between the crank shaft 13 and the blank holding slide 11 is also in accordance with the construction more fully shown and described in my prior patent above re ferred to, the toggle links 32 being connected to toggle arms rigid with the two rock shafts 33 which are operated from a central inclined slide 34 driven by operating means connected to the crank throw 36. By means of the driving connection between the crank shaft 13 and the two independent sets of toggle links, the two upper slides 11 and 12 are so moved that the slide 11 first descends and dwells, and then the slide 12 descends and dwells and in descending produces a suitable drawing operation on the work.

During the time the slide 12 is dwelling, it may itself serve as a blank holder together with the slide 11 while the work is being operated upon by a die which is mounted for reciprocatory movement in a lower portion of the press. Such lower die may be operated by pins extending through holes in a bolster plate 40, the lower ends of the pins resting on an operating plate 41 carried by the lower die carrying slide designated generally 42. The slide 42 is guided for vertical movement in the lower portion of the press frame. At opposite ends of the slide 42 the latter is provided with extensions 43 projecting out laterally beyond the adjacent side portions of the press frame. Each of the extensions 43 rotatably carries a. threaded adjustable member 44 which is internally threaded and engaged with external threads on a post 45. The post is'secured at its upper end to a block 46 which is guided in opposed slides or guides 47 provided in the press frame. The two blocks 46, which are similar in construction, are each pivotally connected to the lower end of an operating rod 48. The upper end of each arm 48 is formed as an eccentric strap 49 eccentrically engaged with cylindrical surfaces 50 eccentrically provided adjacent opposite ends of the crank shaft 13. As the crank shaft 13 rotates the eccentric arms 48 are thus reciprocated vertically, causing vertically reciprocatory movementsof the lower slide 42.

The threaded connection between the post 45 and internally threaded adjusting member 44 at each side of the slide 42 provides for adjustment of the height to which the slide is raised and lowered, in order that the die carried by the lower slide will cooperate properly with the dies carried bevel pinions 52 which engage with bevel gears 53 fixed to a downwardly extending portion 54 of each adjusting member 44. The two members 44'. which are oppositely threaded, are therefore rotated in directions depending upon the direction of rotation of the reversible motor 50 in order to bring the lower slide 42 up to or down to a proper predetermined position depending upon the height of the die it carries and the character of work to be effected.

In accordance with the construction as herein set forth it will be apparent that the driving mechanism by means of which the twoupper slides and the lower slide are all operated from a common driving shaft is simple in construction and thus comparatively light in weight, and that the construction is such as to distribute the power equally so as to avoid vibrational and unbalanced movements or tendencies. The lower slide will be moved upwardly so as to operate upon the work during the time the work is held by the upper slides, Fig. 3 showing the relationship between the movements of the various slides.

While the form of apparatus herein described constitutes a preferred embodiment of the invention, it is to be understood that the invention is not limited to this precise form of apparatus, and that changes may bemade therein without departing from the scope of the invention which is defined in the appended claims.

What is claimed is:

1. A drawing press comprising a frame, first and second upper die slides mounted for reciprocatory movement in said frame, an operating shaft operably connected to said slides, a lower die slide mounted for reciprocatory movement in said frame,and arms extending downwardly from theends of said shaft and connected at their lower ends to sad lower slide for reciprocating the same in timed relation with the movements ofsaid upper slides.

2. A drawing press comprising a frame, first and second upper die slides mounted for reciprocatory movement in said frame, a crank shaft rotatably mounted in an upper portion of said frame and operably connected to said slides for operating them with dwells in their movements, a lower slide mounted for reciprocatory movement in said frame, andeccentric connections from said crank shaft to said lower slide.

3. A drawing press comprising a frame, first and second upper die slides mounted for reciprocatory movement in said frame, a crank shaft, an operable connection including toggle arms between said crank shaft and the first slide, an operable connection including additional toggle arms between said crank shaft and said second slide, eccentrically connected arms extending from opposite end portions of said crank shaft down along the opposite sides of the frame, a lower slide mounted for reciprocato y movement in said frame and a pivotal connection between each of said eccentrically connected arms and said lower slide.

4. A drawing press comprising a frame having a crank shaft rotatably mounted in an upper portion thereof, an outer blank holder and an inner drawing slide mounted for reciprocatory movement in an upper portion of said frame, toggle connections between said crank shaft and each of said slides for operating them with dwells in their movements, a lower slide mounted for reciprocatory movement in said frame; connections from said crank shaft on opposite sides of said frame and extending to saidlower slide, and adjustable threaded means interposed between said lower slide and each of said crank shaft connections for raising and lowering the path of operating movement of said lower slides.

5. A drawing press comprising a frame, an

outer blank holder and an inner drawing slide mounted for reciprocatory movement in an upper portion of said frame, toggle connections between said crank shaft and each of said slides for oper= ating them with dwells in their movements, a lower slide mounted'for reciprocatory movement in said frame, an eccentric connection extending from each end of said crank shaft, and interconnected adjustable threaded means between said lower slide and each of said eccentric connections.

6. A drawing press comprising a frame, an outer blank holder and an inner drawing slide mounted for reciprocatory movement in an upper portion of said frame, toggle connections between said crank shaft and each of said slides for operating them with dwells in their movements, 9.

lower slide mounted for reciprocatory movement in said frame, connections from said crank shaft on opposite sides of said frame and extending to said lower slide, adjustable threaded means interposed between said lower slide and each of said crank shaft connections for raising and low-.

ering the path of operating movement of said lower slide, and a motor carried by said lower slide and similarly connected to both of said threaded means for simultaneously operating the same.

'7. In a power press, a frame, an upper die slide mounted for reciprocatory movement in said frame, a second upper die slide, toggle means for operating both of said slides, a lower die slide mounted for reciprocatory movement in a lower portion of said frame; operating means extending downwardly along opposite sides of said frame for reciprocating said lower slide in timed relation with the movements of the upper slides, a motor carried by said lower slide, and motor operated adjusting mechanism provided between said lower slide and the operating means therefor to raise and lower the path of movement of said lower slide.

8. In a power press, a frame, die slide means reciprocally mounted in an upper portion of said frame, a crank shaft in an upper portion of said frame having operable connections to said die slide means, eccentric arms extending downwardly on opposite sides of the frame and connected-to opposite ends of said crank shaft, a lower slide reciprocably mounted in said frame, adjustable threaded means carried centrally at opposite ends of said lower slide and connected to the lower ends of said eccentric arms, and means for simultaneously and equally operating said threaded means to adjust the path of movement of said lower slide.

ARTHUR A. BYERLEIN. 

